Title:
RING GEAR, GEAR DEVICE AND MOLD FOR MANUFACTURING RING GEAR
Document Type and Number:
Japanese Patent JP2018080826
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide ring gears with improved concentricity, and a gear reduction device.SOLUTION: The ring gear includes a one-piece annular body made from powder metallurgy material, and a first ring gear part and a second ring gear part formed on a surface of the annular body. The first ring gear part and the second ring gear part are arranged along an axial direction of the annular body. The ring gear has a density less than 92% of its theoretical density and a mass of 6.0 to 8.0 grams per cubic millimeter. The present invention further provides a mold for manufacturing the ring gear. The ring gear of the present invention includes two ring gears integrally formed at once, and the two ring gears have improved concentricity.SELECTED DRAWING: Figure 2
Inventors:
TA JING NING
LO LAP WAH
YI XING JU
LI QIU MEI
LO LAP WAH
YI XING JU
LI QIU MEI
Application Number:
JP2017159084A
Publication Date:
May 24, 2018
Filing Date:
August 22, 2017
Export Citation:
Assignee:
JOHNSON ELECTRIC SA
International Classes:
F16H55/06; B22F3/035; B22F5/08; F16H1/28
Domestic Patent References:
| JPS4829900B1 | 1973-09-14 | |||
| JP2000510909A | 2000-08-22 | |||
| JP2008527166A | 2008-07-24 | |||
| JP2013221622A | 2013-10-28 | |||
| JPS4829900B1 | 1973-09-14 |
Foreign References:
| US7854995B1 | 2010-12-21 | |||
| US20140135165A1 | 2014-05-15 |
Attorney, Agent or Firm:
Shinichiro Tanaka
Disciple Maru Ken
▲吉▼田 和彦
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda
Hiroshi Uesugi
Naoki Kondo
Disciple Maru Ken
▲吉▼田 和彦
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda
Hiroshi Uesugi
Naoki Kondo
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